List<Id> approvers = new List<Id>{'005o0000000POyp','005o0000000POyo','005o00000033qPS','005o0000000POyn','005o0000001z4Qz','005o0000000P6Y0','005o0000000POyl','005o0000002mdGZ','005o0000000POzf','005o0000000PZSU','005o0000002H8kV','005o0000003ZFd0'};
            List<Approval.ProcessSubmitRequest> appreqs = new
            List<Approval.ProcessSubmitRequest>();

            for (Id appId : approvers) {
                Approval.ProcessSubmitRequest req = new
                Approval.ProcessSubmitRequest();

                req.setComments('Need approval. Product sample quantity is beyond the limit.');
                req.setObjectId('006o000000GN07w');
                req.setNextApproverIds(new List<Id>{appId});

                appreqs.add(req);
            }

            List<Approval.ProcessResult> ApprovalReqs = Approval.process(requests);